The Geological
Timescale Versus Radiometric Dating
By
Paul Nethercott
October 2014
The Silurian Period
423 To 445 Million Years Ago
|
147Sm/144Nd |
207Pb/206Pb |
87Rb/86Sr |
|
163.83 |
5,199 |
55.20 |
|
33.14 |
4,970 |
32.57 |
|
33.14 |
4,967 |
32.13 |
|
31.77 |
4,966 |
32.01 |
|
30.59 |
4,964 |
30.98 |
|
29.42 |
4,961 |
30.81 |
|
14.02 |
4,960 |
14.08 |
|
12.52 |
4,959 |
14.08 |
|
12.52 |
4,959 |
13.30 |
|
12.52 |
4,959 |
12.91 |
|
12.24 |
4,957 |
12.68 |
|
12.24 |
4,956 |
12.43 |
|
11.77 |
4,955 |
12.32 |
|
11.47 |
4,955 |
11.44 |
|
11.47 |
4,953 |
11.27 |
|
11.47 |
4,952 |
9.05 |
|
11.47 |
4,950 |
7.04 |
The 72 Ma Geochemical Evolution,
Earth and Planetary Science Letters, Volume 183, 2000, Pages 73-92